题目内容
脱式计算
5×
×
×
12×(
+
-
)
÷[1÷(
-
)].
5×
| 1 |
| 3 |
| 2 |
| 5 |
| 3 |
| 10 |
12×(
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
(1)5×
×
×
=(5×
)×(
×
)
=2×
=
;
(2)12×(
+
-
)
=12×
+12×
-12×
=3+4-2
=5;
(3)
÷[1÷(
-
)]
=
÷[1÷
]
=
÷
=
×
=
.
| 1 |
| 3 |
| 2 |
| 5 |
| 3 |
| 10 |
=(5×
| 2 |
| 5 |
| 1 |
| 3 |
| 3 |
| 10 |
=2×
| 1 |
| 10 |
=
| 1 |
| 5 |
(2)12×(
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=12×
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=3+4-2
=5;
(3)
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 7 |
| 7 |
| 15 |
=
| 5 |
| 7 |
| 15 |
| 7 |
=
| 5 |
| 7 |
| 7 |
| 15 |
=
| 1 |
| 3 |
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